Process for making polyurethane resins via thio-group containing diamines

Claim 1

Polyurethane resins based on polyisocyanates, higher molecular weight and optionally also low molecular weight polyhydroxyl compounds and aromatic diamines containing sulphur, characterized in that they contain structural units corresponding to the following general formulae: ##STR19## wherein n represents 0 or 1; X represents one of the following divalent groups: ##STR20## R 3 and R 4 , which may be the same or different, each represents a hydrogen atom; an alkyl group having from 1 to 6 carbon atoms which may be branched; an aryl group having from 6 to 15 carbon atoms; a cycloalkyl group having from 4 to 12 carbon atoms; halogen; --NO 2 ; --CN; --OR 5 ; or a group corresponding to the following general formula: ##STR21## wherein R 5 represents an alkyl group having from 1 to 6 carbon atoms which may be branched; R 1 and R 2 , which may be the same or different, each represents a hydrogen atom; a straight- or branched-chain alkyl group having from 1 to 6 carbon atoms; an aryl group having from 6 to 15 carbon atoms; a cycloalkyl group having from 4 to 12 carbon atoms; or, an acyl group corresponding to the following general formula: ##STR22## wherein Y represents oxygen or sulphur; and R 6 represents a straight- or branched-chain alkyl group having from 1 to 6 carbon atoms or an aryl group having from 6 to 10 carbon atoms.